feat: Support for Telegram Bot API 10.1 with Rich Messages Formatting
- Add support for Rich Messages: RichMessage, RichText, RichBlock.
- Organized RichText and RichBlock subclasses into dedicated subdirectories.
- Updated subEntities() for new subclasses to support accurate nested parsing.
- Added endpoints sendRichMessage and sendRichMessageDraft.
- Added rich_message to Message entity and editMessageText request.
- Added Join Request Queries: answerChatJoinRequestQuery and sendChatJoinRequestWebApp.
- Added supports_join_request_queries to User and guard_bot to ChatFullInfo.
- Added Poll Media Link support: Link and InputMediaLink.
- Created comprehensive API_10.1_FEATURES.md documentation explaining HTML/Markdown formatting for Rich Messages.
- Updated CHANGELOG.md with new features and HTML formatting tag support.